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Unread 10/31/2017, 02:10 PM   #25
bertoni
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,616
A solution that has a large amount of magnesium sulfate in it might have a different refractive index than saltwater, causing it to read inaccurately, but the difference between 1500 ppm and 1275 ppm is too small to have an effect, whether the magnesium is from magnesium chloride or magnesium sulfate.

I'd go with the 1500 ppm measurement, but maybe a local fish store could run a check for you.


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Jonathan Bertoni
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